<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <style>
    /*div {}*/
    div {
      font-size: 12px;
    }
    .nav li > a {
      font-size: 16px;
      font-weight: 700;
      color: palevioletred;
    }
  </style>
</head>
<body>
  <div>456</div>
  <div class="nav">
    <ul>
      <li><a href="">123</a></li>
    </ul>
  </div>
</body>
</html>
